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Trabecular bone strength at the knee.

I Hvid1

  • 1Biomechanics Laboratory, Orthopaedic Hospital, Aarhus N, Denmark.

Clinical Orthopaedics and Related Research
|February 1, 1988
PubMed
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Trabecular bone strength is crucial for knee replacement fixation. While tibial bone strength is lower in rheumatoid arthritis patients and varies with knee alignment, it

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Bone Mechanics

Background:

  • Axial bone strength in the knee is vital for prosthetic component stability after total knee arthroplasty.
  • Understanding trabecular bone resistance to penetration is key for successful surgical outcomes.

Purpose of the Study:

  • To measure and analyze the axial strength of trabecular bone in the tibial and femoral condyles.
  • To investigate the correlation between bone strength and clinical parameters in patients undergoing total knee arthroplasty.

Main Methods:

  • Penetration resistance of trabecular bone was measured in tibial and femoral condyles of 150 patients (47 rheumatoid, 88 osteoarthritic knees).
  • Bone strength was assessed at posterior, central, and anterior locations within each condyle.

Related Experiment Videos

  • Correlations with clinical parameters, knee alignment, and depth from the resection surface were analyzed.

    • Main Results:

    • Tibial bone strength was significantly lower in rheumatoid knees compared to osteoarthritic knees.
    • Bone strength distribution (medial vs. lateral condyles) was dependent on knee alignment (varus knees showed high medial strength).
    • Strength decreased with depth on the tibia but increased with depth on the femur; unloaded condyles showed reduced strength.

    Conclusions:

    • Clinical parameters poorly predicted bone strength; steroid medication did not affect tibial bone strength in rheumatoid arthritis.
    • While tibial bone strength was generally lower than in normal cadaver knees, values insufficient for load-bearing after well-aligned replacement were infrequent.
    • Knee alignment significantly influences regional bone strength distribution, impacting fixation strategies in total knee arthroplasty.